Background: it's long been known that law enforcement officers (LEOs) are _safer_ on the job than non-LEOs. Only an unfortunate few die in violent encounters with the criminal elements. When LEOs scream about how dangerous their job is, they're almost always asking for a pay raise.
Nonetheless, there was a time in the not-so-remote past when LEOs _consciously__accepted_ the possibility that they might die or be injured on the job. That attitude is fast disappearing.
Once one accepts the analogy that "battling crime" (where any "enemy" is poorly defined; those are civilians out there) is equivalent to warfare (where the enemy is well-defined and no quarter given), then one can almost unconsciously accept a "better him than me" attitude where the civilians' lives are, relative to LEO's, worthless.
The creeping acceptance of warfare's "better him than me" attitude by LEOs and police departments is the root of the problem.